XVI 



GLOSSARY. 



Archegoniophore. — A differentiated branch of the thallus 



which bears archegonia. 

 Archegonium. — Female sexual organ of Gymnosperrns and 



Cryptogams. 



Ascidium. — A pitcher-shaped leaf, or portion of a leaf. 



Atavistic. — Reverting to an ancestral condition. 



Auricle. — A small , imperfectly-formed, more or less rounded, 



leaflet or segment occurring on the rachis of a pinnate 



leaf, either between or below the pinnge. 

 Awn. — The extension of the midrib beyond the lamina of the 



glume in certain grasses. 

 Axile. — Of shoot-nature. 



Axillary. — Seated in the angle formed by the insertion of a 



leaf on the axis (really on the leaf -base). 

 Bifid. — Divided half-way down into two. 

 Bifurcation. — Forking. 



Bipinnate. — Of a pinnate leaf in which the leaflets are them- 

 selves pinnate. 



Bisexual. — Possessing both kinds of sexual organs. 



Botrytic. — Branched like a bunch of grapes. 



Bract. — The leaf which subtends an inflorescence or a flower. 



Bracteody. — The change into a bract. 



Bracteole. — A small leaf borne on a peduncle or pedicel. 



Bulb. — A structure consisting of an excessively shortened 

 axis bearing fleshy, food-storing scale-leaves, and a 

 central rudiment of foliage-shoot and inflorescence ; a 

 modified vegetative shoot. 



Bulbil. — A small, axillary shoot, having the general structure 

 of a bulb, but which is probably a modified flower. 



Callus. — Parenchymatous tissue formed by the cambium for 

 the purpose (usually) of covering wounds. 



Calyculus = epicalyx. 



Calyptra. — The old withered neck of the archegonium which 

 becomes carried up on the apex of the sporogonium. 



Cambium. — The meristematic generative layer which gives 

 rise to new tissues. 



Capsule. — A dry, dehiscent seed-vessel. 



Carpellody. — The change into a carpel. 



Caulome. — The category to which all organs of shoot-nature 

 belong. 



Cladode ( = phylloclade) . — A green, leaf-like shoot. 

 Cleistogamous. — Relating to self-fertilized, non-expanding 



flowers ; also to moss-capsules which never open to shed 



their spores. 

 Cob. — The fruiting inflorescence of the maize. 



